[Heath] SG-7 Help

[Garey Barrell]

Ron -

The 150 pF (or mmf as it's on the schematic) should be a silver mica as it's part of the frequency 
determining circuitry.  The original is probably good.

The 0.1 and 0.02 should probably be film type caps as they are the modulator circuit.  Probably bad.

The rest are all bypass capacitors and may be common disc ceramics.  These are almost always good as 
well.

I would also suggest replacing the two 20 uF @ 250 VDC (may be in one tubular package with three 
leads) electrolytic capacitors and the selenium rectifier (replace with 1N4007 diode).

I'd also check all the resistors with an ohmmeter to ensure they are within +/- 10% of the marked 
value.  Several probably are NOT.

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>

Ron Kramer wrote:
> I am rebuilding the unit and am looking for these caps:
> 150uf   Qty 1
> .001uf   Qty 2
> .01uf   Qty 3
> .002uf   Qty 1
> .05uf   Qty 1
> .01uf   Qty 1
> The caps are all rated at 600v. Are these electrolytic caps? The schematic does not show a +/- on 
> each cap.
> Does anyone have some to sell on know where I could find them?
>
> -- 
> Ron KD6EDV
>
> SKCC# 3551
>
> FPqrp# 2132
>
>
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